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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<
html
xmlns
=
"http://www.w3.org/1999/xhtml"
>
<
head
>
<
meta
http-equiv
=
"Content-Type"
content
=
"text/html; charset=gb2312"
/>
<
title
>弹性返回顶部JS代码</
title
>
<
script
type
=
"text/javascript"
>
function goTopEx() {
var obj = document.getElementById("goTopBtn");
function getScrollTop() {
return document.documentElement.scrollTop + document.body.scrollTop;
}
function setScrollTop(value) {
if (document.documentElement.scrollTop) {
document.documentElement.scrollTop = value;
} else {
document.body.scrollTop = value;
}
}
window.onscroll = function() {
getScrollTop() > 0 ? obj.style.display = "": obj.style.display = "none";
}
obj.onclick = function() {
var goTop = setInterval(scrollMove, 10);
function scrollMove() {
setScrollTop(getScrollTop() / 1.1);
if (getScrollTop() < 1) clearInterval(goTop);
}
}
}
</
script
>
<
style
>
BODY {
HEIGHT: 3600px;
}
#goTopBtn {
POSITION: fixed; TEXT-ALIGN: center; LINE-HEIGHT: 30px; WIDTH: 30px; BOTTOM: 35px; HEIGHT: 33px; FONT-SIZE: 12px; CURSOR: pointer; RIGHT: 0px; _position: absolute; _right: auto
}
</
style
>
</
head
>
<
body
style
=
"text-align:center"
>
<
div
style
=
"display: none"
id
=
"goTopBtn"
><
img
border
=
0
src
=
"/${res}/img/go_to_top.png"
></
div
>
<
script
type
=
text
/javascript>goTopEx();</
script
>
<
br
/><
br
/><
br
/><
br
/><
br
/><
br
/><
br
/>
<
p
></
p
>
<
p
><
p
>超出首屏范围，即会出现TOP按钮，否则自动隐藏。<
br
/>
</
p
></
p
>
<
p
></
p
>
</
body
>
</
html
>
|
原文链接：http://www.jb51.net/article/38228.htm
本文转自 小旭依然 51CTO博客，原文链接:http://blog.51cto.com/xuyran/1788311
